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This is a composite image of the interior of the Galilean satillites.
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Internal Warming of an Icy Moon

If the satellite has means of warming itself, then the interior may go through many startling changes as the moon evolves. The moon may change its size, and grow or shrink as the layers inside go through stages of freezing or warming. The moon may also have water inside, and water may exist close enough to the surface to produce conditions favorable for life.

The moon will exhibit proof of all these interior changes in its features on the surface.

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